Disaster recovery

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As a storage administrator, you can be prepared for eventual hardware failure by knowing how to recover the data from another storage cluster where mirroring was configured.

In the examples, the primary storage cluster is known as the site-a, and the secondary storage cluster is known as the site-b. Additionally, the storage clusters both have a data pool with two images, image1 and image2.

These failures have a widespread impact, also referred as a large blast radius, and can be caused by impacts to the power grid and natural disasters.

Customer data needs to be protected during these scenarios. Volumes must be replicated with consistency and efficiency and also within Recovery Point Objective (RPO) and Recovery Time Objective (RTO) targets. This solution is called a Wide Area Network- Disaster Recovery (WAN-DR).

In such scenarios it is hard to restore the primary system and the data center. The solutions that are used to recover from these failure scenarios are guided by the application:

  • Recovery Point Objective (RPO): The amount of data loss, an application tolerate in the worst case.

  • Recovery Time Objective (RTO): The time taken to get the application back on line with the latest copy of the data available.